The further inboard that you can fairlead your sheets, in general, the finer you can trim your jib. If you cannot trim your jib in tight, pointing will suffer. Giulietta has probably done more "research" on this than anyone here actually in possession of a life. It is not at all uncommon for additional tracks to be added to achieve a finer angle on the jib. Racers pay obsessively close attention to this detail. Giulietta would tear his whole deck off if he thought he could gain a better lead on his jib, but then, if you consult your sailnetdictionary/thesaurus under "racer" you'll see his smiling face. You might PM him, just to rattle his cage, and get his input. He'll draw you diagrams. If you have a photo of your deck layout he'll be able to give you specific advise. I would strongly advise you that the photo should only be of the deck layout, containing no images of human beings or animals you may have affection for. Please do not ask me why.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.